package com.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtil {

    private static ApplicationContext applicationContext;
    //获取上下文  
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
    //设置上下文  
    public static  void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        System.out.println("我已经注入啦");
        SpringContextUtil.applicationContext = applicationContext;
    }

    /**
     * 通过name获取 Bean.
     * @param name
     * @return
     */
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    /**
     * 通过class获取Bean.
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }

}
